Hi all,
I was wondering about the report output of ‘v.category option=report’. This output contains a column for each layer that is called ‘count’. Does this ‘count’ refer to the number of vector objects or the number of unique category numbers in that layer (I guess it is the first)? This might differ if two objects share the same category. I think both would be useful, however which one is provided here? Maybe this could be added to the manual, as one could assume that ‘count’ refers to categories numbers?!
Cheers,
Johannes
On 12/09/18 14:40, Johannes Radinger wrote:
Hi all, I was wondering about the report output of 'v.category option=report'. This output contains a column for each layer that is called 'count'. Does this 'count' refer to the number of vector objects or the number of unique category numbers in that layer (I guess it is the first)? This might differ if two objects share the same category. I think both would be useful, however which one is provided here? Maybe this could be added to the manual, as one could assume that 'count' refers to categories numbers?!
The first examples in the man page do implicitely give the answer, i.e.
that it is feature count, not unique category numbers count. Actually, you cannot get this latter information from v.category op=report. AFAIK, you would have to do something like this (in *nix):
v.category YourMap op=print | sort -n | uniq | wc -l
But I agree that the count info is not clearly defined in the man page.
Please file a ticket for this, so we don't forget.
Moritz
Thanks for your quick answer, Moritz!
I filed a ticket for this (https://trac.osgeo.org/grass/ticket/3643)
/Johannes
On Wed, Sep 12, 2018 at 2:58 PM Moritz Lennert <mlennert@club.worldonline.be> wrote:
On 12/09/18 14:40, Johannes Radinger wrote:
Hi all, I was wondering about the report output of ‘v.category
option=report’. This output contains a column for each layer that is
called ‘count’. Does this ‘count’ refer to the number of vector
objects or the number of unique category numbers in that layer (I
guess it is the first)? This might differ if two objects share the
same category. I think both would be useful, however which one is
provided here? Maybe this could be added to the manual, as one could
assume that ‘count’ refers to categories numbers?!
The first examples in the man page do implicitely give the answer, i.e.
that it is feature count, not unique category numbers count. Actually,
you cannot get this latter information from v.category op=report. AFAIK,
you would have to do something like this (in *nix):
v.category YourMap op=print | sort -n | uniq | wc -l
But I agree that the count info is not clearly defined in the man page.
Please file a ticket for this, so we don’t forget.
Moritz
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